Canon 135mm or Tamron 24-70mm

[JPlendPhoto]

I am now considering when do I get the Tamron, I have the money for it now, and I definitely want it for when I go on holiday to Italy in May, then there is a wedding I am shooting a few months later. In the UK the cheapest I see it at is around £800, should I wait and see if the price drops in the next few months?

if you are happy with refurbished wex quite often have them and they go for a bit over £600

In this case, I would rather buy it new.